CN110854881A - Method for participating in primary frequency modulation by combining energy storage and photovoltaic rapid control - Google Patents
Method for participating in primary frequency modulation by combining energy storage and photovoltaic rapid control Download PDFInfo
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- CN110854881A CN110854881A CN201911198622.9A CN201911198622A CN110854881A CN 110854881 A CN110854881 A CN 110854881A CN 201911198622 A CN201911198622 A CN 201911198622A CN 110854881 A CN110854881 A CN 110854881A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention relates to a method for participating in primary frequency modulation by combining energy storage and photovoltaic rapid control, which relates to the field of primary frequency modulation of a power system and comprises the following steps: monitoring the power grid frequency, and comparing the power grid frequency with 50HZ to obtain a frequency difference value; judging the condition of the frequency difference value, and sending a primary frequency modulation control instruction; sending a control signal to the energy storage unit according to the control instruction, wherein the energy storage unit acts to participate in primary frequency modulation; if the power grid frequency cannot meet the frequency modulation requirement within the preset time, a control signal is sent to the photovoltaic unit, and the photovoltaic unit acts to participate in primary frequency modulation; the method can realize the power regulation response of the photovoltaic power station, participate in the primary frequency modulation of the power grid system, and improve the stability of the system.
Description
Technical Field
The invention relates to a method for combining energy storage and photovoltaic fast control to participate in primary frequency modulation, and relates to the field of power system frequency modulation.
Background
With the promotion of the large-scale consumption new energy plan of China, photovoltaic power generation is used as an important component of a smart power grid, and large-scale photovoltaic active participation system frequency adjustment is a necessary choice for ensuring the self safety of a power system. For a system containing high-proportion photovoltaic, the fluctuation of photovoltaic power output and the frequent switching of loads are easy to generate the fluctuation of the dynamic frequency of the system. When the system has frequency failure, a solution of cutting off the photovoltaic power station is usually adopted, which also makes the contradiction of interests of all parties obvious. The traditional stability control system cannot meet the safe and stable operation of the current power grid due to the low response speed, in order to better utilize photovoltaic power generation, the photovoltaic power generation system is urgently needed to actively participate in primary frequency modulation of the power system, and becomes a power grid friendly power supply as a conventional thermal power and hydropower power station, and when a system fault or an emergency accident occurs, the system participates in primary frequency modulation of the system to assist the system to quickly carry out power balance adjustment so as to enable the system to enter a stable state as soon as possible.
In order to meet new requirements, a method for combining energy storage and photovoltaic fast control to participate in frequency control is provided, and therefore photovoltaic power generation can effectively participate in primary frequency modulation of a system.
Disclosure of Invention
The technical problem to be solved by the invention patent is as follows: the method for combining the energy storage and photovoltaic fast control to participate in the frequency control is provided, when the frequency of a power grid fluctuates, the output of a system can be fast adjusted, the primary frequency modulation of the system is participated, and the safety and the stability of the system are improved.
In order to achieve the above technical problem, the present patent provides a method for combining energy storage and photovoltaic fast control, which includes the following steps:
(1) monitoring the power grid frequency, and comparing the power grid frequency with 50HZ to obtain a frequency difference value;
(2) judging the condition of the frequency difference value, and sending a primary frequency modulation control instruction;
(3) sending a control signal to the energy storage unit according to the control instruction, wherein the energy storage unit acts to participate in primary frequency modulation;
(4) if the power grid frequency cannot meet the frequency modulation requirement within the preset time, a control signal is sent to the photovoltaic unit, and the photovoltaic unit acts to participate in primary frequency modulation;
the step (2) further comprises the following analysis: when the frequency difference value is a positive value and is larger than the positive value of the dead zone frequency range, an input control instruction is sent out; and when the frequency difference value is a negative value and is smaller than the negative value of the dead zone frequency range, an output control command is sent.
The step (3) is further analyzed to be; and judging the control instruction, if the control instruction is output, sending a discharging control signal to the energy storage unit, and starting discharging the energy storage unit, and if the control instruction is input, sending a charging control signal to the energy storage unit, and starting charging the energy storage unit.
The further analysis of the step (4) is as follows: presetting primary frequency modulation control time according to the unit condition, and if the power grid frequency cannot meet the frequency modulation requirement within the preset time, sending a control signal to a photovoltaic unit; and judging a control instruction, if the control instruction is an output control instruction, sending a discharge control signal to the photovoltaic unit, quickly controlling the photovoltaic unit to improve the output power, and if the control instruction is an input control instruction, sending a charge control signal to the photovoltaic unit, and quickly controlling the photovoltaic unit to reduce the output power.
A high-speed communication Ethernet network is established between the photovoltaic unit and the control unit used in the step (4), a protocol supporting rapid communication such as GOOSE and Ethercat is adopted, and a power platform structure integrating photovoltaic unit inverter communication and power execution unit software and hardware is established, so that the photovoltaic unit has the capability of rapidly receiving signals and completing target power regulation according to the current equipment state of the photovoltaic unit;
a method for combining energy storage and photovoltaic fast control to participate in primary frequency modulation comprises a measuring and calculating unit, a judging unit, a control unit, an energy storage unit and a photovoltaic unit; the measurement calculation unit is used for monitoring the power grid frequency, calculating the frequency difference value between the power grid frequency and 50HZ, comparing the frequency difference value with the dead zone frequency range and outputting the frequency difference value condition; the judging unit is used for judging the frequency difference value condition and sending out a control instruction; the control unit is used for judging a control instruction, analyzing and adjusting time and sending control signals to the energy storage unit and the photovoltaic unit; the energy storage unit and the photovoltaic unit perform action response according to the control signal sent by the control unit;
the present invention can have the following advantageous effects: the charging and discharging characteristics of the energy storage unit are fully utilized, the output condition of the photovoltaic unit is guaranteed, the photovoltaic unit is not interfered by the frequency of a power grid, and economic loss and adverse social effects caused by the load cutting of a generator cutter are avoided.
Drawings
FIG. 1 is a control flow diagram;
Detailed Description
A method for combining energy storage and photovoltaic fast control to participate in primary frequency modulation comprises a measuring and calculating unit, a judging unit, a control unit, an energy storage unit and a photovoltaic unit; the measurement calculation unit is used for monitoring the power grid frequency, calculating the frequency difference value between the power grid frequency and 50HZ, comparing the frequency difference value with the dead zone frequency range and outputting the frequency difference value condition; the judging unit is used for judging the frequency difference value condition and sending out a control instruction; the control unit is used for judging a control instruction, analyzing and adjusting time and sending control signals to the energy storage unit and the photovoltaic unit; the energy storage unit and the photovoltaic unit perform action response according to the control signal sent by the control unit;
a method for combining energy storage and photovoltaic fast control to participate in primary frequency modulation based on the system structure is shown in a flow chart 1 and specifically comprises the following steps:
1) the measurement and calculation unit monitors the power grid frequency and presets a dead zone frequency range, compares the power grid frequency at the moment with the inherent frequency 50HZ to obtain a frequency difference value, and judges the positive and negative conditions of the frequency difference value; when the frequency difference value is a positive value and is larger than the positive value of the dead zone frequency range, outputting a 1 signal to the judging unit; and when the frequency difference value is a negative value and is smaller than the negative value of the dead zone frequency range, outputting a 0 signal to the judgment unit.
2) The judging unit sends a primary frequency modulation control instruction according to the signal output by the measuring and calculating unit, and sends an input control instruction to the control unit when the received signal is a 1 signal; and when the received signal is a 0 signal, sending an output control instruction to the control unit.
3) The control unit sends control signals to the energy storage and photovoltaic units according to the control instructions output by the judging unit, and a primary frequency modulation control time is arranged in the control unit:
31) when the command received by the control unit is an input control command, a charging control signal is sent to the energy storage unit; when the command received by the control unit is an output control command, a discharge control signal is sent to the energy storage unit;
32) the control unit receives the control instruction sent by the diagnosis unit, counts the acting time of the energy storage unit, and sends a control signal to the photovoltaic unit when the control unit still receives the control instruction output by the judgment unit when the counted time exceeds the primary frequency modulation control time; when the command received by the control unit is an input control command, a power down signal is sent to the photovoltaic unit; and when the command received by the control unit is an output control command, sending a power rising signal to the photovoltaic unit.
4) The energy storage unit receives a control signal sent by the control unit, and when the control signal is a charging control signal, the energy storage unit starts to charge; when the control signal is a discharge control signal, the energy storage unit starts to discharge.
5) The photovoltaic unit receives a control signal sent by the control unit, and when the control signal is a power reduction signal, the photovoltaic unit rapidly controls to reduce the output power; when the control signal is a supply rate rising signal, the photovoltaic unit rapidly controls and promotes the output power.
A high-speed communication Ethernet network is established between the photovoltaic unit and the control unit, a protocol supporting rapid communication such as GOOSE and Ethercat is adopted, and a power platform structure integrating photovoltaic unit inverter communication and power execution unit software and hardware is established, so that the photovoltaic unit has the capability of rapidly receiving signals and completing target power regulation according to the current equipment state of the photovoltaic unit.
Claims (6)
1. A method for participating in primary frequency modulation by combining energy storage and photovoltaic fast control is characterized by comprising the following steps:
(1) monitoring the power grid frequency, and comparing the power grid frequency with 50HZ to obtain a frequency difference value;
(2) judging the condition of the frequency difference value, and sending a primary frequency modulation control instruction;
(3) sending a control signal to the energy storage unit according to the control instruction, wherein the energy storage unit acts to participate in primary frequency modulation;
(4) if the power grid frequency cannot meet the frequency modulation requirement within the preset time, a control signal is sent to the photovoltaic unit, and the action of the photovoltaic unit participates in primary frequency modulation.
2. The method for participating in primary frequency modulation by combining energy storage and photovoltaic fast control according to claim 1, wherein the step 2) judges the condition of the frequency difference value and sends out a primary frequency modulation control command; when the frequency difference value is a positive value and is larger than the positive value of the dead zone frequency range, an output control instruction is sent out; and when the frequency difference value is a negative value and is smaller than the negative value of the dead zone frequency range, sending an input control command.
3. The method for the combination of the energy storage and the photovoltaic fast control to participate in the frequency control according to the claim 1, wherein the step 3) sends a control signal to the energy storage unit according to the control command, and the energy storage unit acts to participate in the primary frequency modulation; and judging the control instruction, if the control instruction is output, sending a discharging control signal to the energy storage unit, and starting discharging the energy storage unit, and if the control instruction is input, sending a charging control signal to the energy storage unit, and starting charging the energy storage unit.
4. The method for combining energy storage and photovoltaic fast control to participate in frequency control according to claim 1, wherein the step 4) presets a primary frequency modulation control time according to the unit condition, and if the grid frequency cannot meet the frequency modulation requirement within the preset time, a control signal is sent to the photovoltaic unit; and judging a control instruction, if the control instruction is an output control instruction, sending a discharge control signal to the photovoltaic unit, quickly controlling the photovoltaic unit to improve the output power, and if the control instruction is an input control instruction, sending a charge control signal to the photovoltaic unit, and quickly controlling the photovoltaic unit to reduce the output power.
5. The method of claim 1, wherein a high-speed communication Ethernet network is established between the photovoltaic unit and the control unit, and a power platform structure integrating photovoltaic unit inverter communication and power execution unit software and hardware is established by adopting protocols such as GOOSE and Ethercat supporting rapid communication, so that the photovoltaic unit has the capability of rapidly receiving signals and completing target power regulation according to the current equipment state of the photovoltaic unit.
6. A method for participating in primary frequency modulation by combining energy storage and photovoltaic fast control is characterized by comprising a measurement calculation unit, a judgment unit, a control unit, an energy storage unit and a photovoltaic unit; the measurement calculation unit is used for monitoring the power grid frequency, calculating the frequency difference value between the power grid frequency and 50HZ, comparing the frequency difference value with the dead zone frequency range and outputting the frequency difference value condition; the judging unit is used for judging the frequency difference value condition and sending out a control instruction; the control unit is used for judging a control instruction, analyzing and adjusting time and sending control signals to the energy storage unit and the photovoltaic unit; the energy storage unit and the photovoltaic unit perform action response according to the control signal sent by the control unit.
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| CN111864770A (en) * | 2020-08-19 | 2020-10-30 | 国网河南省电力公司电力科学研究院 | Energy storage auxiliary frequency modulation scheduling method based on cloud energy storage |
| CN112311009A (en) * | 2020-10-28 | 2021-02-02 | 国网经济技术研究院有限公司 | Fusion power station and multi-station fusion participation power grid coordination control method and system |
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Application publication date: 20200228 |